MP4 to OPUS: extract audio
Pull the soundtrack out of a MP4 video and save it as OPUS. Your video stays on your device: nothing is uploaded.
How to convert MP4 to OPUS
- Add your MP4 files. Drop one or more .mp4 files on the box above, or tap it to pick them from your device.
- Let it convert. The first video you convert loads the converter once (about 31 MB, then cached). After that it runs on your device; a progress bar shows how far along it is.
- Download the OPUS. Press Download next to each file. Nothing was sent to a server, so close the tab and it's gone.
What is a MP4 file?
MP4 with H.264 video and AAC sound is the most compatible video format there is. It plays on every phone, TV, browser and editing app and is what social networks expect.
What is OPUS?
Opus is the audio codec used by WhatsApp voice notes, Discord and video calls. It sounds great at very low bitrates.
Why convert MP4 to OPUS?
MP4 is great for playing and uploading everywhere, but slightly larger than modern codecs like VP9 or AV1 at the same quality. OPUS is the better choice for voice notes and calls; keep in mind many players, editors and upload forms don't accept .opus files.
Will I lose quality?
OPUS uses lossy compression tuned so the difference is invisible to the ear at normal use. We use high-quality settings by default.
Private by design
Most online converters upload your file to their servers. This one doesn't: the converter itself is loaded into your browser and works offline from there, so your videos never leave your phone or computer.
Questions
Is this MP4 to OPUS converter free?
Yes, completely free, with no sign-up, no watermark and no daily limit.
Are my MP4 files uploaded?
No. The conversion happens inside your browser on your own device. Nothing is sent to us or anyone else.
Can I convert MP4 to OPUS on iPhone or Android?
Yes, in a modern browser. Phones are slower than computers for video, and very long videos can run out of memory on older phones.
Can I convert several files at once?
Yes. Drop as many as you like; they are converted one after another and each gets its own download button.
Is there a file size limit?
No fixed limit, but your browser has to hold the whole file in memory, so files over about 2 GB may fail.